Answer: World war 2
Explanation:
I would go back to world war 2 and help the Americans British and French to stop the Germens. 1939 to 1945 was the year that WW2 started and ended and millions of inccent people died because of Adolf Hitler. In 1945 the Germens lost war unfornetly it last 7 years. So, that is why I would go back and try to make a differnce and help save more peoples lives
